Qinghai-Xizang Plateau as a risen heat source may have a significant impact on Asian and the global climate, especially plays an important role for the outbreak of monsoon. It exists a self-contained climate of pressure system on the Tibet Plateau, which is an independent winds formed under the heat of Plateau. Therefore, the thermal effects of the Qinghai-Xizang plateau would have been affected on the plateau monsoon. In order to further understand the relationship between the Qinghai-Xizang plateau monsoon and the atmospheric heat source/sink, using the daily and monthly reanalysis data of the NCEP/NCAR from 1948 to 2013 to analyze the relationship between the change date of plateau atmosphere heating source collection and the plateau monsoon, and the strength of those two. The results show that during the past 66 years, the average monthly plateau heat source is obvious seasonal variations. The strongest heat collection occurs in January and the strongest heat source in July. The heat collection turns into heat source approximately in April, while the heat source turn into the heat collection in October. The heat collection turns into heat source approximately in 15 pentad, while the heat source turn into the heat collection roughly among 58 pentad. Compared with the summer monsoon establishment date, the change from heat sink to heat source is about 3 pentad earlier than that of summer monsoon, and the transition from heat source to heat sink is about 1 pentad ahead of end date. The relationship between thermal effects with the intensity of the summer plateau monsoon presents a positive correlation. When the atmospheric heat source is strong, the plateau summer monsoon is strong. When the atmospheric heat source is weak, the plateau summer monsoon is weak. In the stronger heat source years, convergence is strong in the plateau body, yet divergence becomes strong in the plateau around. In the weak heat source years, convergence is weak in the plateau body, yet divergence becomes weak in the plateau around. The atmospheric thermal gradient between the plateau and around indicates an apparent seasonal change as well. The atmospheric thermal gradient between the plateau and around positively correlates with the plateau monsoon in July, in detail, the effect of the plateau summer monsoon would be stronger as the thermal gradient becomes bigger and the effect of the plateau summer monsoon would be weaker as the thermal gradient becomes smaller.
ZENG Yuchan
,
FAN Guangzhou
,
LAI Xin
,
HUA Wei
,
ZHANG Yongli
. Relationship Between the Qinghai-Xizang Plateau Monsoon and the Atmospheric Heat Source/Sink[J]. Plateau Meteorology, 2016
, 35(5)
: 1148
-1156
.
DOI: 10.7522/j.issn.1000-0534.2015.00093
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